[Bug libstdc++/79254] [5/6/7 Regression] basic_string::operator= isn't exception safe

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79254

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu.org

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #3)
> That patch is wrong, it also needs this in the catch block to restore the
> original allocator:
> 
>   _M_get_allocator() = __guard._M_alloc;

And we only need to restore anything if (__guard._M_ptr != nullptr)

I'll test the complete patch tomorrow.